Upgrade CPU+MOBO, do I need to reinstall OS?

Hi,
My system is currently running Solaris 8 on Pentium II. I would like to upgrade the CPU to Pentium III 550, change motherboard and mem chips. Everything else is kept the same including backup drive, ether cards, etc.
My question is would I need to reinstall the OS? This machine takes a while to configure so I'm trying to avoid that.
Thanks in advanced.

Thanks for the replies. I did the upgrade (new mobo+cpu+mem) over the weekend and I was forced into maintenance (read-only) mode because it said "couldn't open /dev/rdsk/c0d0s0" which was my hard drive before the upgrade.
The reason: the path to my hd has changed from /pci@0,0/pci-ide@4,1/ide@0/cmdk@0,0:a to /pci@0,0/pci-ide@7,1/ide@0/cmdk@0,0:a
I couldn't do devfsadm either because I was in read-only mode. But I found the solution on the net:
Boot from CD to single user, mount HD to /a and recreate the devices with drvconfig, tapes, ports, disks.

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Upgrade CPU+MOBO, do I need to reinstall OS?

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